If you want to drive the absolute cleanest car possible – and if you’re reading this site, we’re willing to wager that you do – then you need to calculate the total well-to-wheels energy use of the car and everything you put into its tank or battery. When it comes to comparing types of vehicles – hydrogen, standard gasoline and diesel, or battery electric – then a full accounting of the averages reveals that electric cars are the total efficiency winners. At least, they are in a new study from the UK-based Transport & Environment. DON'T MISS: Electric cars are cleaner than hybrids The results are not even close. Starting with all renewable energy for either charging or to process the gasoline or hydrogen, all-electric vehicles managing an overall efficiency rating of 73 percent, compared to 22 percent for hydrogen fuel cell vehicles, and just 13 percent for standard fossil...